Answer
m$\angle$D=63
Work Step by Step
Slide $\triangle$ABC over to $\triangle$DEF to see that angles A and D are congruent so their measures are equal.
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 2 - Section 2.6 - Symmetry and Transformations - Exercises - Page 116: 15a
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